WOAH!!! This is amazing for a first try!I will say the black outlines are a tiny bit to thick, but still it is very very good! You did very good on the leg shading and the eyes, you added light in the perfect places :3the cutie mark looks really good as well.The mane and tail looks good, I like the dark blue streak through the tail..The back leg looks good :3

I really don't know what to say it's so good

You did a very amazing job for a first try! I hope you draw more. Anyhowl, have a good weekend